A 10 microcoulomb charge is placed at the origin and a 20 ...

[Shelles]

A 10 microcoulomb charge is placed at the origin and a 20 microcoulomb charge is placed on the x-axis at x = 40 cm. If an electron is placed on the y-axis at y = 30 cm, what is the magnitude of the force it will experience?
 
  A)
 
  0.615  10-12 N
  B)
 
  2.46  10-13 N
  C)
 
  4.92  10-13 N
  D)
 
  1.23  10-13 N
  E)
 
  2.46  10-14 N

Question 2

Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 1536 Hz. You move between the speakers,
 
  along the line joining the them, at a constant speed of 2.8 m/s. What beat frequency do you observe? The speed of sound in the room is 330 m/s.
  A)
 
  13 Hz
 
  B)
 
  431 Hz
 
  C)
 
  26 Hz
 
  D)
 
  4.7 Hz
 
  E)
 
  118 Hz

[dawsa925]

Answer to Question 1

B

Answer to Question 2

C

[Shelles]

Excellent

[scikid]

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